Yieldable gearing.



A. A. EWALD.

YIELDABLE GEARING.

APPLICATION FILED MAY 31, 1910.

988,182. Patented Mar. 2 8, 1911.

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2 SHEETS-SHEET 1.

A. A. EWALD.

YIELDABLE GEARING. APPLICATION FILED MAY 31, 1910.

988, 1 82. Patented Mar. 28, 1911.

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ETERS c0, WASHINGTON, a. c.

ARNO A. EWALI), F OAKFIELD, WISCONSIN.

YIELDAIBLE GEARING.

Specification of Letters Patent.

Application filed May 31, 1910.

Patented Mar. 28, 1911.

Serial No. 564,203.

To all whom it may concern:

Be it known that I, AnNo A. EWALD, a citizen of the United States,residing at Oakfield, in the county of Fond du Lac and State ofVisconsin, have invented certain new and useful Improvements inYieldable Gearing; and I do declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

This invention relates to yieldable gearing, and is especially adaptedfor use with driving mechanisms for cream separators and like machines.

- One object of my invention is to provide a simple, efiicient andinexpensive transmission device for actuating machines of thischaracter.

Another object of my invention is to provide a gearing which will drivea machine of this character smoothly and easily and will absorb alljerks or sudden movements of the driving shaft when the engine or motoris started.

With the foregoing and other objects in view, the invention consists ofcertain novel features of construction, combination and arrangement ofparts as will be more fully described and particularly pointed out inthe appended claims.

In the accompanying drawings Figure 1 is a perspective View of myimproved gearing. Fig. 2 is an end elevation of the same. Fig. 3 is across section taken on the line 3-3 of Fig. 2. Fig. 4 is a sideelevation of a pulley equipped with an intermediate pawl and ratchetclutch. Fig. 5 is a central sectional View of the same; and Fig. 6 is adetail elevation of the clutch mechanism.

Referring particularly to the accompanying drawings, 5 designates adriving or power shaft, and 6 a sleeve suitably fixed thereon as by theset screw 7. The sleeve 6 is provided at one end with a radiallyextending arm 8 having a tongue 9 extending inwardly therefrom, saidtongue being provided with suitable apertures 10 and 11 therein, forpurposes to be hereinafter set forth. Extending through one of saidaper- 'tures, as 10, is an adjusting device, herein shown as a bolt 12provided with a hook or eye 13 at one end and threaded at its oppositeend to receive an adjusting nut 14.

A pulley 15 is loosely mounted upon the sleeve portion 6, and adjacentone end of its hub is provided with a flange 16 having a peripheralgroove 17 therein for the reception of a coil spring 18, which embracessaid flange. One end of the coil spring 18 is secured to the radial arm8 through the aperture 11 and its opposite end, after passing around theflange 16, is suitably secured to the hook or eye 13 of the adjustingbolt 12.

It will be apparent from the foregoing description that the onlyconnection between the rotating hub or sleeve 6 and the pulley isthrough the coil spring 18, and said coil spring may be put undertension to grip the pulley with a greater or less degree of friction.

In practice, the spring is tightly stretched to grip the periphery ofthe flange 16 by means of the adjusting bolt 12 mounted in the radialarm 8 of the sleeve portion 6, and the rotation of the driving shaft 5is directly communicated by the sleeve to the pulley 15, while theresiliency of the coil spring '18 serves to absorb all jerks and suddenmovements of the driving shaft, the spring slipping or sliding withinthe peripheral groove of the flange without communicating the suddenmovements to the pulley.

In Figs. 4 to 6, the pulley 15 is revolubly mounted around the sleeve 6,which sleeve is preferably provided with an aunular recess 19surrounding an intermediate hub or core 20, suitably secured upon thedrive shaft 5, as by the set screw 21. Projecting radially in said hubor core 20, and adapted to extend within the recess 19 in the sleeve 6,is a lug 22 provided with oppositely disposed openings 23 for thereception of the head 24: of a pawl 25 adapted to cooperate with theinwardly extending radial teeth or lugs 26 carried by the sleeve 6. Asherein shown, the pawl 25 is constructed with a flat face 27 adapted tooperatively engage the inclined faces 28 of the radial teeth 26 torotate the sleeve 6 in the direction desired, and a rounded back portion29 adapted to contact with the teeth 26 to depress the pawl when the hubor core 20 is rotated in the reverse direction. A suitable spring 30 ispositioned to normally hold the pawl 25 in its outermost position. Thehead 24 of the pawl 25 is preferably loosely mounted within one of theopenings 23 in the lug 22 and may be readily detached or removedtherefrom and replaced in the same or another ofsaid openings as desiredto rotate the pulley 15 in either direction.

In order to prevent accidental lateral movement of the sleeve 6 upon thehub or core 20, the hub 20 is preferably provided with an annular flange31 adapted to rotate between the outer face of the sleeve 6 and. theheads 32 of the headed screws or bolts 34 extending from the sleeve 6 atsuitable intervals.

When it is desired to rotate the pulley 15 through the intermediatemechanism hereinbefore described, the drive shaft 5 is revolved rotatingthe hub or core 20 and the pawl 25 carried thereby, the flat face 27 ofsaid pawl contacting with the inclined face 28 of one of the inwardlyextending teeth 26 carried by the sleeve 6, thereby rotating the sleeve6 in the same direction as the drive shaft 5. The rotation of the sleeve6 through the tension spring 18 serves to rotate the pulley 15 in themanner hereinabove described. It will be apparent that should the driveshaft be irregularly driven or at any time be subject to jerks or suddenmovements, the spring 18 will suflice to take up the same before theyare communicated to the pulley 15, which will thereby be enabled tocontinue its rotation with a smooth and even motion. Should the driveshaft 5 be accidentally or temporarily driven in the reverse direction,the rounded back portion 29 of the pawl 25 will contact with the teeth26 and be pressed inwardly out of engagement with the inclined faces 28of the teeth or lugs v26, allowing the hub or core 20 to rotate withoutaffecting the movement of the sleeve 6 or the pulley 15.

From the foregoing description taken in connection with the accompanyingdrawings, the construction and operation of the invention will bereadily understood without requiring a more extended explanation.

Various changes in the form, proportion and the minor details ofconstruction may be resorted to without departing from the principle orsacrificing any of the advantages of this invention as defined in theappended claims.

Having described my invention, I claim:

1. The combination of a drive shaft, a sleeve adapted to be rotatedthereby and provided with a radially-extending arm, a pulley looselymounted upon said sleeve, and a spring arranged to grip said pulley andhaving its ends secured to said arm.

2. The combination of a drive shaft, a

sleeve adapted to be rotated thereby and provided with a radial arm, apulley loosely mounted on said sleeve, an adjusting device carried bysaid arm, and a spring arranged to grip said pulley having one endsecured to the radial arm and its other end secured to said adjustingdevice.

3, The combination of a drive shaft, a

sleeve adapted to be rotated thereby and having a radial arm, a tongueon said arm provided with apertures, a pulley loosely mounted upon saidsleeve, a coiled spring arranged to grip the pulley and having one ofits ends secured in an aperture in the radial arm, an adjusting boltextending through another aperture in said arm, and means for securingthe free end of the spring to said bolt.

.4. The combination of a drive shaft, a sleeve arranged to be rotatedthereby and provided with a radial arm, a pulley loosely mounted on saidsleeve and having an annular grooved flange, a coiled spring passingaround said flange and resting in the groove therein, one end of thespring being secured to said radial arm, and an adjusting device mountedin said arm and secured to the opposite end of the spring. i

5. The combination of a drive shaft, a

hub secured thereto, a sleeve loosely mount ed upon said hub and havinga radially extending arm, a pulley loosely mounted upon said sleeve, aspring arranged to grip said pulley and having its ends secured to saidarm, and means arranged between the head and the sleeve for causing thesleeve to move with the hub.

6. The combination of a drive shaft, a head secured thereto, a springpressed pawl carried thereby, a sleeve loosely mounted upon said hub andhaving an outwardly extending radial arm and also having a plurality ofinwardly projecting teeth adapted to be engaged on said pawl, a pulleyloosely mounted upon said sleeve and provided with an annular flange,and a coiled spring passing around said flange and having its endssecured to said radial arm.

7. The combination of a drive shaft, a hub secured thereto, a springpressed pawl carried thereby, a sleeve loosely mounted upon said hub andhaving an outwardly eX- tending radial arm and also having a pluralityof inwardly projecting teeth adapted to be engaged by said pawl, apulley loosely mounted upon said sleeve and provided with an annularflange, a coiled spring passing around said flange and having one of itsends secured to the radial arm, and an adj usting means secured betweenthe other end of the coiled spring and said radial arm.

8. The combination of a drive shaft, a hub secured thereto and having anannular lot flange, a sleeve loosely mounted upon said hub and providedwith a radial arm, means extending from said sleeve and cooperating withsaid annular flange to prevent lateral movement of said sleeve upon thehub, means arranged between said sleeve and hub to operatively connectthe same, a pulley mounted upon said sleeve and provided with an annularflange, and a coiled spring passing around said flange and having its 10ends connected with said arm.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

ARNO A. EWALD. Witnesses:

A. M. HILL, W. E. BRISTOL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). 0.

